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This information is based on alternate scenes or materials, and is not considered canon within the overall plot of the AU.

* Do not edit this page without the author's permission.

Core!Chara is a human out!code created by Trica13. While they share a similar origin and title as CORE!Frisk, they’re not from the same AU as them.  They’re a human child who been scattered across time and space by being tossed into the CORE by W.D. Gaster. They go around the Multiverse destroying Genocidal Timelines as an act of Mercy.


Their Surface Life

Chara was born in Brasil, within the city of São Paulo in 19XX to a poor and abusive family. Chara used to live in a small house with their parents, the house that they lived in had little to no living conditions and the money was also very few, only being enough for a bit of food at the table at each meal.

Because of this, Chara was forced to work the days on end to sustain their family if they did not do it they would be severely punished by their father. The punishments varied from being locked up inside a dark basement the whole night left with no food whatsoever to being mentally abused and even beaten.

Their father never saw Chara as their son but rather as an animal that was destined to sustain the family, the only one who truly cared about them was their mother, but she saw herself forced to beat her own child up being too afraid of what her husband would do to her if she didn't comply.

Chara was always seen as a very quiet kid by their neighbors and as a weird and scary kid by the children, a few even tried starting a conversation with them but the people didn't receive any answers from Chara. Everyone was really unaware of what was going on in their lives and soon there were rumours all over the place about them..

One unfortunate night, after Chara came back from work, they found their mother dead on the floor near a wall, right in front of them was their father holding a bloodied knife with his own wife's blood dripping from it. The sight was just too much for Chara to beer, tears started to stream from their eyes when their father turned to look at them he immediately grabbed Chara by the neck to too finish them off, just like he did to Chara's mother. Chara tried to scream, but nothing came out, they were suffocating. As their father was about to stab them, they managed to grab out a piece of wood to defend themselves from their own father and escape into the woods.

They ran and ran until they finally arrived at Mt. Ebott, exhausted and injured they ended up slipping and falling in.

Their life Underground

Chara was later found by Asriel and taken in by the Royal Family. At first, Chara was scared and confused, they hardly even said anything, but as the time went by they started to open up more and more to their new-found family about their past and how their life on the Surface used to be.

Monsters welcomed Chara with open arms... They made many friends Underground, they've never been so happy before, however Chara's hate for humanity just grew as each day passed, they wanted to make them pay for all the pain that they put Chara through... Chara was told by Asriel that there was no way out for monsters Underground and that everyone's dream was to see the Surface again... After that day, Chara started to think about a plan to save everyone in the underground, after all, they deserved it after what they have done for them. Chara would do their best to see the people who've made them finally able to find happiness, love and care, even more happiness. They didn't have any intentions on letting anyone down but something changed things forever..

Meeting Frisk

Some days later, before Chara told Asriel their plan to save everyone and finally be free, Frisk fell into the underground, this new human was different from any other human, they were filled with an immense urge to kill and so they started a mass genocide on everyone, first the ruins, then snowdin and so on, one by one, monsters were dying in very painful ways the few survivors of this being Sans and Gaster that had been in the lab all day. Some hours later Frisk finally arrived at New Home, Chara wasn't aware of what was happening at all as they were playing with Asriel in the royal family garden. Sometime went by, when Chara finally became aware of the strange silence in their newfound home, when they went to check what was happening they had told Asriel to stay in their bedroom and that's when they saw it.

Frisk murdering both of their new parents right in front of them... Both Toriel and Asgore had been caught unawares and when they had seen Frisk, the human had told them that they'd kill everyone they've ever loved, but, the royal parents wouldn't let their children die but they also knew that they didn't have much of a chance against this human and so, both parents told Frisk that they would let them kill them as long as Chara's and Asriel's lifes could be spared, Frisk had agreed with it though they also told the parents that if the remaining survivors were to stay in their way they'd also be murdered.

Chara was simply standing there in shock, a flood of emotions and questions going through them, fear, rage, sadness, regret but the one emotion they were feeling the most now was hate... Why was this human killing everyone that they ever loved and why were they being forced to watch it? Why did it have to be this way?Their family and friends were all being turned into nothing more but a pile dust.. After a moment of pure silence, something had snapped from within Chara as they let out a scream, hearing this, Asriel bolted out of the room to see what was wrong with their sibling and that's when they saw Chara and Frisk standing there, Asriel went up to Chara to try and comfort them but before Asriel could do anything Frisk went over and grabbed him, holding him hostage. And that's when Frisk forced Chara to make a choice, themselves or their brother? Of course, Chara picked themselves but before Frisk could do any harm to Chara, Asriel managed to force Frisk to stab himself by grabbing their arm and forcing the knife right into his neck. Asriel had choosen to die for his sibling, smiling, Asriel waved Chara a last goodbye and turned to dust.. Frisk simply stood there, laughing, as tears streamed down Chara's face and that was when Chara fully snapped, they launched themselves at Frisk and started to attack them with all they had. During the proccess of fighting each other Chara had gotten stabbed by Frisk but they managed to steal Frisk's knife away and finally kill them with all they had, Chara didn't show mercy to Frisk at all, they simply stabbed them until they were dead. Chara was now standing there with the dusts of their brother, their mother, their father and with the body of their killer, everything came crashing down at Chara and they weren't themselves anymore at all, they simply got up, picked Frisk's knife up and completely blinded by pain, they went away..


Chara walked all the way down to the lab having gone completely insane, they entered and saw both Gaster and Sans standing there asking themselves what had happened for Chara to be behaving in such a weird way, Sans walked up to Chara to try and reason with them since they were friends together and knew each other quite well, what Sans wasn't expecting was that as soon as they got close to Chara they had tried to stab them in a rush, Gaster, lifted Chara's SOUL and tossed them right at the CORE, Gaster acted on impulse to protect his son. Sans tried to go for Chara's aid but it was already too late, they were gone...

Slowly but surely Chara felt themselves fading away, they did not try to fight it they were too tired to do so. After hours and hours Chara found themselves on a black dimension with nothing around, the only thing that they seemed to remember was a blurry image of 3 monsters and Frisk. And so, Chara stood there on total nothing.

Their dimension time:

During their time in the dimension Chara found themselves able to see and access genocide routes all at the same time, they could hear their cries, their pleas for the pain to stop and seeing these timelines suffering made them feel bad about the people, something that they hadn't felt in a long time. So that's when Chara decided that they would put a complete end to the timelines that were in severe pain and that clearly couldn't be helped anymore.



Their hair is often dark grey and short, they have white skin and a pair of Void looking eyes, they have dark markings on their eyes that ressemble the pain they felt after falling into the CORE and getting their soul scattered across time and space, those markings were the bits of 'hatred' that were left in Chara's being after the incident. Like any other Chara, they have circle marking on their face these being light grey, which are quite well hidden by the markings on their face, when Chara feels angry or any other strong emotion the circles on their cheeks become dark grey. They often wear a long sleeve sweater, with a long light grey horizontal line in the middle & dark grey shorts, the shorts being a bit ripped after the incident.

Their true body was never truly scattered across time and space but their soul was, they can manifest clones of themselves through out genocide timelines but can only destroy them with their own physical body there.


CORE!Chara has an extensive knowledge about the Undertale Multiverse and everyone living in it, but they do not know everything, in fact, they tend to act dumb on the easiest topics mostly to joke around or mock a certain individual, but this mocking of theirs can turn out to come out as cruel, even if they don't intend for it to be that way. Chara has a strong aversion towards other Universe's Frisks, mainly because of their own past with their Frisk, they can still tolerate some other Frisk's presences as they are aware that these Frisks aren't their own, but if they do they'll either act in a pretty blunt manner towards them or simply avoid making any contact at all, in some cases someone can end up getting hurt. Chara is often serious and wary around strangers as they've got some trust issues and believe that the only person they can truly trust in the Multiverse is themself and they make that clear multiple times, but this does not mean that they hate interacting with others from time to time as they've shown being capable of having some sort of alliance with others, even in their own strange way. Chara loves some chaos and chocolate, they hate being bored that's why they are always looking for new things to do, be it destroying genocidal timelines or watching as other people fight. They are not someone who should be potrayed as totally good, because of their "only trust yourself" nature, Chara has developed quite the manipulative mindset to get their way on certain situations and this way of theirs tends to involve violence and they'd go quite far to get it on situations. Chara's time destroying other genocidal timelines has made them become insensitive, which ends up rubbing off on how they act. They don't mind doing evil things either, if it is of benift to them then they'll do it without any problems, however, they do not take any pleasure when they hurt others nor do they do it for their own amusement.


  • Multiversal Clone Manifestation: Chara can manifest only one clone of themselves through out genocide timelines, which allows them to be at multiple places at many times, but they can only do this on genocide timelines not on pacifist ones, they would have to manifest their original form on a pacifist timeline if they wanted to appear.
  • Multiversal Omnipresence: They are everywhere and nowhere at the same time.
  • Regeneration: They can regenerate their clones if they are damaged but it does take a while for them to do so, as the clones are much more fragile and can be easily killed off than their own physical form.
  • Void Knives: Chara's void knives are their main weapon, they can summon up to 5 void knives around them. The void knives can erase any object completely out of existance upon coming in contact with it, though when the knives come in contact with a living being they can cause some bad damage to it, leaving the being with some bad stab wounds that can take quite a long time to heal and that don't instantly heal even with advanced healing. Chara can also fuse their knives together making them become The Erasure Sword.
  • Chara's Erasure Sword: Chara uses this sword to erase genocidal timelines completely, they can also erase pacifist timelines using the sword too, though they can only manifest one sword at a time per timeline and it takes quite a long time for them to erase a pacifist timeline giving the people enough time to fight Chara off, they erase genocide timelines more faster.


Native AU (Under!Core/Under!Despair)


Chara and Asriel had a brotherly relationship with each other, meaning that they were really close to one another, they did everything together, sleep, play, talk. Chara might not remember him that well but they still have got some feelings from the past about him.


Chara genuinly hates Frisk because of everything they put them through.


Gaster and Chara had quite a nice relationship with each other as Gaster is sans's father. Chara remembers him quite properly and they don't like him because of his actions towards them, though Gaster does regret what he did to them.


Chara and Sans were once friends, Chara met him when they fell into the underground, Sans was younger back then, they were good friends.


Papyrus met Chara too all that time ago, and they became great friends, he, Sans, and Asriel along with Chara used to play hide and seek together, and Papyrus was the greatest at this game. Chara always loved Papyrus sphaguetti, it was really nice while it lasted.



If Chara ever comes across Core!Frisk, they might end up fighting due to Chara's past with their Frisk.


If Chara ever comes across Error they might end up sharing some sort of friendship with each other since Chara likes destruction but a different destruction than the one that Error does, I imagine them as some sort of destruction buddies hanging out with each other, destroying some things.


Ink and Chara could end up sharing a possible small friendship with each other but nothing too close because of Chara's trusting issues.


If Chara ever comes across Nightmare they might end up having a neutral relationship with each other, simply tolerating one another, not more than that.


If they ever come across Perseverance they would end up fighting because she is one of Core's minions.


If they ever come across each other Chara and Cross could have a rather friendly relationship with each other, at least, in Chara's point of view.


If Reapertale!Chara ever comes across this Chara, they might end up fighting because Core!Chara is aware of Reaper's relationship with Core!Frisk.


If those 2 ever come across each other they might end up having a truce between each other to go against Reapertale!Chara, and possibly sharing a friendship too.


Chara does not like Dream's positive nature, in a way, they find him to be quite annoying and even a nuisance at some point, but they don't completely hate dream either, deep down they feel as if they could relate to him in some ways.


Chara seems to spy on Zer0 from time to time, they wish to know more about him and his powers as they've never seen something such as him before, but they prefer not to ask him anything to him and do everything while keeping their distance, they don't have any intentions in harming Zer0 though.


They've had a brief meeting before.These two share a very tricky relationship, for a first encounter that is, in one way, Frisk sees Chara as an enemy because they don't truly know about their true intentions when it comes to destroying the Genocidal Timelines, in another way Chara simply does not like Frisk because they are who they are. Chara sees them as annoying and simply wants to possibly avoid meeting them in the future, but Frisk started to see Chara as a possible enemy, so that's not going to be as easy.


Artwork made by: DarknessReaper9

Core!Chara's previous skin made by: Me.